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왕벚나무 잎으로 제조된 바이오차의 Pb(II) 흡착특성
이명은(Myoung Eun Lee),황규택(Kyu Taek Hwang),김선영(Sun Young Kim),정재우(Jae Woo Chung) 유기성자원학회 2018 유기물자원화 Vol.26 No.2
Large amounts of leaves from street trees fall onto the streets annually and need to be cleaned and treated. Cherry trees are common street trees in Korea. The adsorption characteristics of Pb(II) by cherry leaf (CL) and cherry leaf-derived biochar (CB) were studied through a series of batch experiments. CB was produced through the carbonization of CL at 800℃ for 90 min. Carbonization increased the C content and pH value, while decreased H and O contents. Well developed pore structure was observed at the surface of CB. The pseudo-second order model better described the kinetics of Pb(II) adsorption onto CL and CB, indicating that the rate-limiting step of the heavy metal sorption is chemical sorption. Fast adsorption rates and high adsorption capacities were obtained by the carbonization from CL to CB. Langmuir models better adequately described the Pb(II) adsorption onto CL and CB. Maximum adsorption capacities of Pb(II) expressed by Langmuir constant, Q⁰ were 37.31 mg/g and 94.34 mg/g, when CL and CB were used as adsorbents, respectively. 매년 가로수로부터 많은 양의 낙엽이 발생하고 이는 적절하게 수거하여 처리해야 한다. 왕벚나무는 우리나라에서 일반적인 가로수이다. 왕벚나무 잎(CL)과 그것으로부터 제조된 바이오차(CB)의 Pb(II) 흡착특성에 관한 회분식 실험을 수행하였다. 바이오차는 800℃에서 90분간 탄화시켜 제조하였다. 흡착특성을 규명하기 위해 동력학적 및 등온 흡착실험을 수행하였다. 탄화과정은 바이오차의 탄소함량과 pH 값을 증가시키고 수소와 산소함량을 감소시켰다. 또한, 잘 발달된 공극 구조가 바이오차의 표면에 관찰되었다. CL과 CB에 의한 Pb(II) 흡착은 2차 속도모델에 의해 적절하게 설명될 수 있는 것으로 나타나 흡착반응의 속도가 물리적 흡착보다는 화학적 흡착에 의해 결정됨을 알 수 있었다. CB는 CL에 비해 더 빠른 흡착반응과 높은 흡착용량을 가지는 것으로 나타났다. Pb(II)의 등온흡착 특성은 Langmuir 모델에 의해 보다 적절하게 설명될 수 있는 것으로 나타났다. Langmuir 상수, Q⁰에 의해 설명되는 최대흡착용량은 CL이 37.31 mg/g, CB가 94.34 mg/g으로 나타났다.
전철홍,민영옥,황규택 대한골절학회 1992 대한골절학회지 Vol.5 No.1
True osteochondral fracture of the capitellum is quite rare in the skeletally immature. Two children with fracture of the capitellum hmeri treated by open reduction and internal fixation with navicular screws. Avascular necrosis of the capitellum or limitation of the elbow joint was not observed. The following clinical results were satisfactory. We report these cases with a review of the literature.
교합성 골수강내 금속정을 이용한 경골 분절 골절의 치료
이병창,전철홍,이한솔,황규택,권순구 대한골절학회 1997 대한골절학회지 Vol.10 No.3
The orthopaedic surgeon experiences the difficulties of treating segmental tibial fractures by internal fixation and accompanying complications. Object: The purpose of this study has been to review the useful treatment of 21 interlocking nails in the tibial segmental fracture, to investigate the union rate related to fracture types and to analyze the complications related to it. Material and Method: Between November 1988 and August l995, the authors treated tibial segmental fractures with interlocking intramedullary nail and analyzed 21 cases with followed up of more than 1 year. Injury mechanism were caused by traffic accident in which high velocity accounted for 17 cases. 11 cases of segmental tibial fracture were closed, and 10 cases were open. 6 cases of open fracture were open type I, and 4 cases were open type II. We treated 21 fractures with unreamed intramedullary nail of 7 cases and limited reamed intramedullary nail of 14 cases. Result: Callus formation and consolidation were faster at the posterolateral aspect of the tibia than in anteromedial aspect. Radiologically complete union was faster in proximal portion at average 26.8 weeks than distal portion of segmental fracture at average 35.6 weeks. Complications included 2 cases of nonunion, 1 infection, 2 screw breakage and 2 ankle joint stiffness. Conclusion: We achieved excellent results using interlocking intramedullary nail by limited reaming or unreamed method in the tibial segmental fracture even though the injury was caused by high-velocity external force.